133 lines
4 KiB
C++
133 lines
4 KiB
C++
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// Copyright (c) 1997 - 1998 Microsoft Corporation. All Rights Reserved.
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// Pump.cpp : Implementation of CStream
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#include "stdafx.h"
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#include "project.h"
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DWORD WINAPI WritePumpThreadStart(void *pvPump)
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{
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return ((CPump *)pvPump)->PumpMainLoop();
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}
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CPump::CPump(CStream *pStream) :
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m_pStream(pStream),
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m_hThread(NULL),
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m_hRunEvent(NULL),
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m_bShutDown(false)
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{}
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CPump::~CPump()
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{
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if (m_hThread) {
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m_CritSec.Lock();
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m_bShutDown = true;
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Run(true);
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m_CritSec.Unlock();
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WaitForSingleObject(m_hThread, INFINITE);
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}
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if (m_hRunEvent) {
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CloseHandle(m_hRunEvent);
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}
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}
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HRESULT CPump::CreatePump(CStream *pStream, CPump **ppPump)
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{
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CPump *pPump = new CPump(pStream);
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if (pPump) {
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pPump->m_hRunEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (pPump->m_hRunEvent) {
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DWORD dwId;
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pPump->m_hThread = CreateThread(NULL, 0, WritePumpThreadStart, (void *)pPump, 0, &dwId);
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if (pPump->m_hThread) {
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*ppPump = pPump;
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return S_OK;
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}
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}
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delete pPump;
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}
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*ppPump = pPump;
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return E_OUTOFMEMORY;
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}
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void CPump::Run(bool bRunning)
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{
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if (bRunning) {
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SetEvent(m_hRunEvent);
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} else {
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ResetEvent(m_hRunEvent);
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}
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}
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HRESULT CPump::PumpMainLoop()
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{
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while (true) {
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WaitForSingleObject(m_hRunEvent, INFINITE);
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m_CritSec.Lock();
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bool bShutDown = m_bShutDown;
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m_CritSec.Unlock();
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if (bShutDown) {
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return 0;
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}
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IMediaSample *pMediaSample;
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HRESULT hr = m_pStream->GetBuffer(&pMediaSample, NULL, NULL, 0);
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if (SUCCEEDED(hr)) {
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LONG lChopSize = m_pStream->GetChopSize();
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HRESULT hrReceived = S_OK;
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if (lChopSize != 0) {
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// Send data in smaller batches generating
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// appropriate timestamps
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CMediaSample *pSample = (CMediaSample *)pMediaSample;
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PBYTE pbStart;
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pMediaSample->GetPointer(&pbStart);
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// Make these const so we don't accidentally
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// update them
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PBYTE pbCurrent = pbStart;
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const LONG lLength = pSample->GetActualDataLength();
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const LONG lSize = pSample->GetSize();
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const REFERENCE_TIME rtStart = pSample->m_rtStartTime;
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const REFERENCE_TIME rtStop = pSample->m_rtEndTime;
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LONG lLeft = lLength;
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while (lLeft != 0) {
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LONG lToSend = min(lLeft, lChopSize);
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pSample->SetActualDataLength(lToSend);
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pSample->SetSizeAndPointer(pbCurrent, lToSend, lToSend);
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pSample->m_rtEndTime =
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pSample->m_rtStartTime +
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MulDiv((LONG)(rtStop -
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pSample->m_rtStartTime),
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lToSend,
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lLeft);
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hrReceived = m_pStream->m_pConnectedMemInputPin->Receive(pMediaSample);
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if (S_OK != hrReceived) {
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break;
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}
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pbCurrent += lToSend;
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pSample->m_rtStartTime = pSample->m_rtEndTime;
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lLeft -= lToSend;
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}
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// Put everything back
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pSample->m_rtStartTime = rtStart;
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pSample->m_rtEndTime = rtStop;
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pSample->SetSizeAndPointer(pbStart, lLength, lSize);
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} else {
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hrReceived = m_pStream->m_pConnectedMemInputPin->Receive(pMediaSample);
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}
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CSample *pSample = ((CMediaSample *)pMediaSample)->m_pSample;
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pSample->m_bReceived = true;
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if (hrReceived != S_OK) {
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AtlTrace(_T("Receive returned %i. Aborting I/O operation/n"), hrReceived);
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pSample->m_MediaSampleIoStatus = E_ABORT;
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}
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pMediaSample->Release();
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}
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};
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}
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